<?php 
class facebook_widget extends WP_Widget {
 
    function facebook_widget() {
        $widget_ops = array( 'classname' => 'facebook-widget','description' => 'Hiển thị facbook like book' );
        $control_ops = array( 'width' => 250, 'height' => 350, 'id_base' => 'facebook-widget' );
        $this->WP_Widget( 'facebook-widget','Kid - Faceboox', $widget_ops, $control_ops );
    }
     
    function widget( $args, $instance ) {
        extract( $args );
 
        $title = apply_filters('widget_title', $instance['title'] );
        $page_url = $instance['page_url'];
 
        echo $before_widget;
        if ( $title )
            echo $before_title;
            echo $title ; ?>
        <?php echo $after_title; ?>
            <div class="facebook-box">
                <iframe src="http://www.facebook.com/plugins/likebox.php?href=<?php echo $page_url ?>&amp;width=300&amp;colorscheme=light&amp;show_faces=true&amp;border_color&amp;stream=false&amp;header=false&amp;height=260" scrolling="no" frameborder="0" style="background:#FFF; border:none; overflow:hidden; width:300px; height:260px;" allowTransparency="true"></iframe> 
            </div>
    <?php
        echo $after_widget;
    }
 
    function update( $new_instance, $old_instance ) {
        $instance = $old_instance;
        $instance['title'] = strip_tags( $new_instance['title'] );
        $instance['page_url'] = strip_tags( $new_instance['page_url'] );
        return $instance;
    }
 
    function form( $instance ) {
        $defaults = array( 'title' =>__( 'Facebook' , 'tie') );
        $instance = wp_parse_args( (array) $instance, $defaults ); ?>
 
        <p>
            <label for="<?php echo $this->get_field_id( 'title' ); ?>">Title : </label>
            <input id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" value="<?php echo $instance['title']; ?>" class="widefat" type="text" />
        </p>
        <p>
            <label for="<?php echo $this->get_field_id( 'page_url' ); ?>">Page Url : </label>
            <input id="<?php echo $this->get_field_id( 'page_url' ); ?>" name="<?php echo $this->get_field_name( 'page_url' ); ?>" value="<?php echo $instance['page_url']; ?>" class="widefat" type="text" />
        </p>
 
 
    <?php
    }
}
add_action( 'widgets_init', 'Facebook_widget_box' );
function Facebook_widget_box() {
    register_widget( 'facebook_widget' );
}